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Reports until 11:34, Tuesday 27 June 2023
H1 ISC
marc.pirello@LIGO.ORG - posted 11:34, Tuesday 27 June 2023 - last comment - 14:24, Tuesday 11 July 2023(70872)
Installed ITMY Baffle PD Amp

Per WP11286 in response to ALOG70818

We installed the spare S1302233 Baffle PD Amplifier directly below the installed Baffle PD Amplifiers into SUS R5 in the Biergarten.  ITMX is S1400066 and ITMY was S1400065 but we swapped functionality to the spare we just mounted below it (this rack is mostly empty).

If there are issues with the spare we can immediately swap functality back to the old unit.  If the spare fixes the issues, we will recover the old unit and perform a post mortem.  As there was no laser light during install we could not verify functionality while on the floor.

M. Pirello, F. Mera

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thomas.shaffer@LIGO.ORG - 15:23, Tuesday 27 June 2023 (70893)

We seem to see some signal on this pd now, unlike before. Interestingly, the pd seems a fair amount of light during the ISC_LOCK state of Move_Spots. Clearly we are moving through a place with high scatter, best to avoid.

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marc.pirello@LIGO.ORG - 14:24, Tuesday 11 July 2023 (71240)

I pulled the ITMY Baffle PD Amplifer S1400065 and moved the replacement S1302232 up to occupy positions 11 & 12 to the right of the ITMX Baffle PD Amplifier.  Post mortem on S1400065 showed that one of the internal cables was loose, this has been fixed and all cables pull tested.  S1400065 has been included in the spares inventory.

This completes WP11286

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